Fill in the blanks to complete the passage about why firms do not always increase their production. Firms use cost data to make decisions about how many units to produce based on their blank costs. Increasing production may not always lead to an increase in profit. Increasing production will cause a firm's blank costs to increase, which could outweigh any benefits that were previously gained by lowering their overheadwhich is determined by their blank costs in the short run. - fixed - variable - fixed and variable - average fixed